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P1128 Diagnostic Trouble Code Discussion for April 2006

Closed Loop Fueling Not Achieved - Bank 1

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Trouble Ticket Help Requests for DTC P1128
Help Request Posted
2001 Volkswagen Passat GLS 1.8L MIL Lamp on VIN: WVWPD63BX1
P1128: Lean Air Fuel Mixture Bank1. Hey Folks- This Passat trips a mil light for lean condition. PO1128 is the only code and there are no drivability problems. Checked for any vac leaks but found none. With Snap-on scanner the o2 voltage for the Front sensor seems to just hang at1.54 volts which...
April 03, 2006
2000 Volkswagen Golf GLS 2.0L MIL Lamp on VIN: WVWGC21J0Y
P1128: bank 1 long term fuel trim system too lean. ... check engine light on, no diveability symptons reported. I pulled codes and there was 9 codes stored, P1225, P1226, P1227, P1228, P1451, P1421, P1425, P1472, & P1128. 8 out of the 9 were short to ground related codes. I cleared codes had customer drive...
April 05, 2006
1998 Volkswagen Beetle 2.0L Poor Idle Quality, Cuts out, Stall VIN: 3VWBB61C8W
P1128: bank 1 lean. vehicle came in barley running. found the brake booster vaccum lines cracked. replaced them. found #1 spark plug wire shorting out. replaced plugs and wires. chk compression while i had the intake off and found compression was 175-180 psi on all cylinders. ohm...
April 14, 2006
1998 Volkswagen Beetle 2.0L MIL Lamp on VIN: 3VWBB61C1W
P1128: fuel mixture lean. I was told that the MAF is the most likely cause for this code to be set. It is an active code that came right back after being reset. What is the next step to confirm mechanic's "GUT" instinct?
April 24, 2006